DOM missing pieces

Major features:

• Document unload
• Cross-origin tainting
• MessageChannel/MessagePort
• Remaining 2d canvas APIs
• Sequential focus navigation
• IndexedDB
• Transferable objects
• CSP
• iframe sandbox
• iframe srcdoc
• Cross-origin wrappers
• https://github.com/annevk/html-cross-origin-objects
• Cache
• Selection
• <script type=module>
• https://bugzilla.mozilla.org/show_bug.cgi?id=1240072
• Random HTML elements
• SVG
• MathML
• webperf?
• Security features from webappsec?

Tasks:

• ... review test failures in wpt ...
• ... look through Gecko's webidl directory ...
• ... look through platform.html5.org ...